Ultrasonic vibration and vacuumizing integrated micro injection mold and molding method

An ultrasonic vibration and vacuuming technology, which is applied in the field of micro-injection molding and its molds, can solve the problems of difficulty in the flow of melt filling, unsatisfactory filling of micro-plastic parts, and poor exhaust of micro-cavities, so as to improve the degree of automation and production. Efficiency, reduced requirements, energy and cost savings

Inactive Publication Date: 2012-07-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a set ultrasonic A micro-injection molding system that integrates vibration, vac...

Method used

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  • Ultrasonic vibration and vacuumizing integrated micro injection mold and molding method
  • Ultrasonic vibration and vacuumizing integrated micro injection mold and molding method
  • Ultrasonic vibration and vacuumizing integrated micro injection mold and molding method

Examples

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Effect test

Embodiment 1

[0029] When the melt temperature is 210°C and the mold temperature is 65°C, injection molding of micro-cylindrical array plastic parts is carried out;

[0030] Without vacuum and ultrasonic vibration, the filling height of the micro cylinder is 174μm;

[0031] When vacuum was applied but without ultrasonic vibration, the filling height of the micro cylinders was 183 μm; an increase of 9 μm;

[0032] After applying ultrasonic vibrations and vacuuming, the filling height of the micropillars increased to 213 μm; an increase of 30 μm.

Embodiment 2

[0033] Example 2 When the melt temperature is 240°C and the mold temperature is 80°C, the micro-cylindrical array plastic part is injection-molded. It is measured that the micro-cylindrical filling height reaches 276 μm without vacuuming and ultrasonic vibration;

[0034] When the melt temperature was lowered to 230°C and the mold temperature was still at 80°C, vacuum exhaust injection molding was performed without ultrasonic vibration, and the measured filling height of the micro cylinder was still 276 μm;

[0035] When the melt temperature is still maintained at 230°C and the mold temperature drops to 75°C, ultrasonic vibration and vacuum exhaust are performed simultaneously, and the measured filling height of the micro cylinders can still reach 276 μm.

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Abstract

The invention relates to an ultrasonic vibration and vacuumizing integrated micro injection mold and a molding method and belongs to the technical field of micro injection molding. An embedded structure with a replaceable molding micro-structure insert is adopted by the mold; a part of an end face of an ultrasonic vibrator for processing a molding chamber is capable of directly applying ultrasonic vibration to flux; at the moment of injection molding, a real-time signal in an injection molding machine is utilized to control the starting and stopping of an ultrasonic vibration system and a vacuumizing system; the adopted supersonic vibration frequency is 23-27KHz and the input power is 35-350W; and vacuum degree of the vacuumizing system is -1MPa. According to the molding method provided by the invention, the ultrasonic vibration and vacuum-exhausting are effectively integrated and are applied to the injection molding process of a micro molding piece; the technical conditions, such as limit injection molding pressure and temperature, adopted in the traditional micro injection molding, are avoided; the demand on capacity of the injection molding machine is reduced; energy source and cost are saved; the integrated automatic control for the injection molding machine, the ultrasonic vibration system and the vacuumizing system is realized; and the degree of automation and production efficiency of the micro injection molding process are increased.

Description

technical field [0001] The invention belongs to the research field of micro-injection molding and its mold technology, and relates to a micro-plastic injection mold design and a molding process method for integrated application of ultrasonic vibration and vacuum exhaust. Background technique [0002] In recent years, with the rapid development of MEMS technology, the demand for miniature plastic parts is increasing day by day, and the quality requirements are also constantly improving. However, various defects caused by the scale effect in the molding of micro-plastic parts have always been the key issues that plague the development of micro-injection molding and its mold technology and the application of micro-plastic parts in various fields. For example, micro-products such as biological microneedle arrays, microfluidic chips, cell culture dishes, light guide plates, optical fiber connectors, and micro gyroscopes, which are widely used in the fields of biomedicine, optics,...

Claims

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Application Information

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IPC IPC(8): B29C45/34
CPCB29C2045/0094B29C45/568B29C45/2673
Inventor 于同敏黄晓超包成祝思龙
Owner DALIAN UNIV OF TECH
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